Paris for a week, Le Marais and my birthday!

I'm meeting my boyfriend in Paris for a week-long adventure celebrating my 40th birthday! We're renting an apartment in the Marais, and we both speak French, though we're both rusty. Any recommendations, especially for the big day? Thanks.

Depends on what you're willing spend. For a fun, moderately priced bistro, le Taxi Jaune on the rue Chapon in the 3rd... 30 to 40€. For an upmarket birthday, la Grande Cascade in the Bois de Boulogne... 100€ for lunch.

Whatever you do, try to weave in a visit to the Piano Bar at the Closerie des Lilas on the boulevard Montparnasse.